I didn't think they did until I read this recent article. One example passage is: "We also saw a whale egg close to shore, in which Scotty, the 1st mate, explained
that whale eggs always end up on shore". And then this article which says "If people have any issues with battery farming whales, they could buy the free range whale eggs for a premium". If whales are mammals, that means the platypus is not the only mammal that lays eggs. Did these 2 articles make simple mistakes or is a widely known factoid completely wrong?